A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
A pale olive green background with a seamless texture.
Source V. Hartikainen
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
This one is amazing, truly original. Go use it!
Source Viahorizon
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Prismatic Groovy Concentric Background
Source GDJ
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Black And White Floral Pattern Background from PDP.
Source GDJ
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Prismatic Abstract Geometric Background 2 No Black
Source GDJ